第15章

来源：互联网发布：数据库系统组成内容编辑：程序博客网时间：2024/06/11 04:57

import java.util.Scanner;public class Dome5 {Scanner input = new Scanner(System.in);public void Loan() {System.out.println("***欢迎进入登录系统***");boolean flag = true;System.out.println();do {System.out.print("请输入身份证:");String id = input.next();System.out.print("请输入您的手机号:");String shou = input.next();System.out.print("请输入您的座机号:");String zuo = input.next();String[] name = zuo.split("-",2);if (id.length() != 16 && id.length() != 18) {System.out.println("身份证必须16位或18位!");}if (shou.length() != 11) {System.out.println("手机号必须11位!");}if (name[0].length()!= 4 && name[1].length()!= 7) {System.out.println("座机号必须4位,");}      if((id.length() == 16 || id.length() == 18)&&(shou.length() == 11)&&(name[0].length() == 4 && name[1].length() == 7)){      System.out.println("注册成功!");      flag=false;      }} while (flag);       }public static void main(String[] args) {Dome5 v = new Dome5();    v.Loan();}}

import java.util.Scanner;public class Dome4 {String goods[] = { "电风扇", "洗衣机", "电视机", "冰箱", "空调" };double prices[] = { 124.23, 4500, 8800.60, 5000.88, 120000.46 };double money;Scanner input = new Scanner(System.in);public boolean Loan(String name, String pwd) {boolean flag = false;if (name.equals("Tom") && pwd.equals("123")) {flag = true;}return flag;}public void Show() {System.out.println("*********************欢迎进入商品批发市场********************");System.out.println("\t编号\t商品\t价格");for (int i = 0; i < goods.length; i++) {System.out.println("\t" + (i + 1) + "\t" + goods[i] + "\t"+ Show1(prices[i]));}System.out.println("******************************************************");System.out.println();System.out.print("请输入您批发的商品编号:");int num = input.nextInt();System.out.print("请输入您的批发数量:");int num1 = input.nextInt();switch (num) {case 1:money = 124.23 * num1;break;case 2:money = 4500 * num1;break;case 3:money = 8800.60 * num1;break;case 4:money = 5000.88 * num1;break;case 5:money = 12000.46 * num1;break;}System.out.println("您需要付款:" + Show1(money));}public StringBuffer Show1(double money1) {StringBuffer str = new StringBuffer(String.valueOf(money1));for (int i = str.indexOf(".") - 3; i > 0; i -= 3) {str.insert(i, ",");}return str;}public static void main(String[] args) {Dome4 v = new Dome4();Scanner input = new Scanner(System.in);System.out.print("请输入您的用户名:");String name = input.next();System.out.print("请输入您的密码:");String pwd = input.next();System.out.println();if (v.Loan(name, pwd)) {v.Show();} else {System.out.println("登录失败!");}}}

import java.util.Scanner;public class Dome6 {public static void main(String[] args) {Scanner input = new Scanner(System.in);System.out.println("请输入一个字符串:");String c = input.next();String[]name1;name1=c.split("");System.out.println("请输入您的查询的字符:");    String name=input.next();    int num=0;    for (int i = 0; i < name1.length; i++) {if(name.equals(name1[i])){num++;}}System.out.println(num);}}

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